a{
    text-decoration: none;
}

#banner{
    background:rgb(220,220,220);
    background-repeat: no-repeat;
    width: 100%;
    height: 335px;
    background-size: 100% 100%;
}

#banner div{
    background-image: url("../img/about-usbanner.jpg");
    background-repeat: no-repeat;
    margin: 0 auto;
    width: 1280px;
    height: 335px;
    background-size: 100% 100%;
}

.blank{
    width: 100%;
    height: 50px;
    margin: 0px;
    padding: 0px;
}

#about_us_center{
    width: 1280px;
    margin: 0 auto;
}

#about_title{
    width: 1280px;
    margin: 0 auto;
    text-align: center;
}

#about_item{
    width: 1280px;
    height: 350px;
    margin: 0 auto;
}

#about_item .left{
    height: 100%;
    width: 55%;
    float: left;
    font-size: 13px;
}

#about_item .right{
    height: 50%;
    width: 35%;
    float: right;
    background-color: rgb(241,241,241);
}

#about_item .right .title{
    text-align: center;
}

#about_item .right .double_link{
    text-align: center;
    text-decoration: none;
}

#about_item .right .double_link div{
    height: 45px;
    width: 190px;
    border: 3px solid black;
    padding-top: 20px;
}

#about_item .right .double_link a{
    color: black;
    font-size: 14px;
}

#list_case{
    width: 1280px;
    margin: 0 auto;
}

#list_case .line{
    width: 100%;
}

#list_case .line_item{
    width: 392px;
    height: 500px;
    background-color: rgb(239,239,239);
    float: left;
    margin-left: 25px;
}

#list_case .line_item .top{
    width: 392px;
    height: 238px;
}

#list_case .line_item .text{
    margin-top: 70px;
    width: 392px;
    height: 238px;
    text-align: center;
}




